Maybe they were talking about this:
http://nextelonline.nextel.com/en/so...ail_work.shtml
But that's primarily for the Instinct. The TP runs Windows Mobile, which you can set up to connect directly with your work Exchange server through ActiveSync on the device. Doing that will activate Push Mail, but this is something that has to be setup at the server end and offered by the company you work for.
There's also a service called Good Mobile Messaging, which can also provide real-time syncing/push services for both MS Exchange and Lotus Notes servers, but again that has to be something your company offers to you.
There's nothing really offered by Sprint that gives you a "soandso@sprintmail.com" address. At least, not anymore, and even when they did offer that it was never available as Push mail.